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I know my carrier model units. I have nightmares that I'm being chased off the roof by 50TMs and 48TDs that morphed into transformers and need to extract service information from my frontal lobe with a egg beater

Thanks everyone for the help. I know a whole lot more now than I did before.

I could not make out a serial number on the York.

I may have gotten some of the numbers slightly wrong, so if something does not make any sense, it may be because I could not read my own handwriting.

They are definitely gas heat rooftop units

There are a couple of 1988 yorks up there, too, still working fine, but I plan to replace those 2 this year anyway. I could tell they were 1988 because the sticker says manufactured 1988 on those. Which is good, because nearly everything else is faded out.